funnel, the isopropyl iodide separated, dried over calcium
chloride, poured off and fractionated in a distilling- flask. It
distils entirely at 88—89°. Yield 30—35 grams.
-2. CH2OH CHJ
CHOH + 3HI = CHI + 3H20
CHI +2HI I
= CHI + 2l2
Propenyl triiodide is probably formed as an intermediate pro-
duct, though it does not exist in the free state.
Properties.—^Colourless liquid ; b. p. 89*5°; sp. gr. 1744 at o°.
See Appendix•, p, 260.
Bpichlorhydrin, " \O/"
Reboul, Annalen^ SpL, 1861,1, 221.
200 grms. glycerol.
160 c.c. glacial acetic acid.
The glycerol, which must be dehydrated (see p. 106), is mixed
with an equal volume of glacial acetic acid. Hydrochloric acid
gas (see Fig. 65, p. 93) is passed into the cold liquid for about
two hours, when it ceases to be absorbed. The mixture is now
heated on the water-bath, and, after standing twenty-four hours,
the current of gas is continued for about six hours more. The
liquid is distilled with a thermometer.* Hydrochloric acid is
first given off, together with acetic acid. As the temperature
rises, the dichlorhydrin and acetodichlorhydrin distil. The
portion distilling at 160—210°, consisting mainly of dichlorhydrin,
is collected separately and used for the preparation of epichlor-